tarbell



UNITED STATES PATENT OFFICE.

E. W. TARBELL, OF BOSTON, MASSACHUSETTS, ASSIGNOR T0 IIIMSELF AND EDWIN A. SIMONDS, OF SAME PLACE.

STEAM-BOILER.

Specification of Letters Patent No. 27,954, dated April 17, 1860.

To all whom 'it may concern:

Be it known that I, EDMUND W. TARBELL, of South Boston, in the county of Suffolk and State of Massachusetts, have invented an Improved Upright Steam Boiler or Generator; and I do hereby declare the same to be fully described and represented in the following specification and the accompanying drawings, of which- Figure l is an external elevation, and Fig. 2, a vertical section of it.

In such drawings, A exhibits the outer case of the boiler, which may be cylindrical in form within and concentric with such case is another, viz., B, the two being connected at their ends so as to form between them a space or chamber a.

Two plates C, D, extend across the inner case B, and at a short dist-ance apart, so as to form a water space b, and to divide the interior of the case B, into two compartments CZ, e, the lower of which may serve as a furnace or chamber of combustion and be fitted with a grate and ash pit and a fuel supplying throat. The superior chamber e, is a smoke and heat space and may be connected with a chimney by aV pipe or flue. The two chambers CZ, e, are also connected by one or more short pipes f, f, f, extending through the water space Z9. Furthermore,

a series of bent pipes c, c, c, c, project from the water space Z), downward within the furnace d, and bend toward the casing B, and open into the water space a, as shown in Fig. 2, the same serving to form a communication between the two spaces a, and b.

When a. re is made in the chamber of combustion cl, the external surfaces of the pipes c, c, will be exposed to the flame and heat, and such iame and heat will also circulate through the pipes f, and pass into the chamber c. It will also act on the upper and lower plates of the water chamber b, and on the inner surface of the casing B. l/Vhen the boiler is supplied with water to a level above the space Z), a very large amountof heating surface will be exposed to the action of the flame.

I claim- The combination and arrangement of the water and steam space a, the transverse water space b, and the series of bent connection tubes c, 0, the furnace cl, the smoke or heat chamber c, and the connection tube or tubes 7", the whole forming an upright boiler or steam generator.

E. WV. TARBELL. lVitnesses:

R. H. EDDY, F. R. HALE, Jr. 

